Differential chaos shift keying (DCSK) communication method and device based on three-dimensional constellation

Abstract

A differential chaos shift keying (DCSK) communication method based on three-dimensional constellation is provided. Target information bit is mapped to a three-dimensional constellation symbol. An initial chaotic signal generated by a chaotic generator is processed by cyclic shift to generate a chaotic signal group including the initial chaotic signal, a first shifted chaotic signal and a second shifted chaotic signal. Information modulation is performed based on the three-dimensional constellation symbol and the chaotic signal group to obtain an information-bearing signal. A transmission signal is generated based on the information-bearing signal and the initial chaotic signal, and sent to a receiver to generate a received signal, which is subjected to information recovery analysis in the receiver to obtain an estimated information bit. A DCSK communication device based on three-dimensional constellation is also provided.

What is claimed is: 
     
       1. A differential chaos shift keying (DCSK) communication method based on three-dimensional constellation, comprising:
 mapping target information bit to a three-dimensional constellation symbol; 
 processing an initial chaotic signal generated by a chaotic generator by cyclic shift to generate a chaotic signal group, wherein the chaotic signal group comprises the initial chaotic signal, a first shifted chaotic signal and a second shifted chaotic signal; 
 performing an information modulation based on the three-dimensional constellation symbol and the chaotic signal group to obtain an information-bearing signal; 
 generating a transmission signal based on the information-bearing signal and the initial chaotic signal, and sending the transmission signal to a receiver to generate a received signal; and 
 performing an information recovery analysis on the received signal in the receiver to obtain an estimated information bit. 
 
     
     
       2. The DCSK communication method of  claim 1 , wherein the step of performing an information modulation based on the three-dimensional constellation symbol and the chaotic signal group to obtain an information-bearing signal comprises:
 carrying an x-axis amplitude, a y-axis amplitude and a z-axis amplitude of the three-dimensional constellation symbol respectively on the initial chaotic signal, the first shifted chaotic signal and the second shifted chaotic signal to obtain the information-bearing signal. 
 
     
     
       3. The DCSK communication method of  claim 1 , wherein the step of generating a transmission signal based on the information-bearing signal and the initial chaotic signal, and sending the transmission signal to a receiver to generate a received signal comprises:
 performing pulse shaping on the initial chaotic signal and the information-bearing signal respectively to obtain a pulse chaotic signal and a pulse information-bearing signal; 
 based on a preset carrier frequency, generating the transmission signal according to the pulse chaotic signal and the pulse information-bearing signal; and 
 sending the transmission signal to the receiver to generate the received signal. 
 
     
     
       4. The DCSK communication method of  claim 1 , wherein the step of performing an information recovery analysis on the received signal in the receiver to obtain an estimated information bit comprises:
 subjecting the received signal to filtering through a matched filter in the receiver to obtain a received reference signal and a received information-bearing signal; 
 processing the received reference signal by cyclic shift through a cyclic shift transformer to generate a received chaotic signal group, wherein the received chaotic signal group comprises the received reference signal, a third shifted chaotic signal and a fourth shifted chaotic signal; 
 calculating a decision vector according to the received information-bearing signal and the received chaotic signal group; 
 based on minimum Euclidean distance detection, estimating a label of the three-dimensional constellation symbol according to the decision vector; and 
 performing information recovery on an estimated label to obtain the estimated information bit. 
 
     
     
       5. A differential chaos shift keying (DCSK) communication device based on three-dimensional constellation, comprising:
 a symbol mapping unit; 
 a cyclic shift unit; 
 a modulation unit; 
 a generating-transmitting unit; and 
 an information recovery unit; 
 wherein the symbol mapping unit is configured to map a target information bit to a three-dimensional constellation symbol; 
 the cyclic shift unit is configured to process an initial chaotic signal generated by a chaotic generator by cyclic shift to generate a chaotic signal group, wherein the chaotic signal group comprises the initial chaotic signal, a first shifted chaotic signal and a second shifted chaotic signal; 
 the modulation unit is configured to perform an information modulation based on the three-dimensional constellation symbol and the chaotic signal group to obtain an information-bearing signal; 
 the generating-transmitting unit is configured to generate a transmission signal based on the information-bearing signal and the initial chaotic signal, and send the transmission signal to a receiver to generate a received signal; and 
 the information recovery unit is configured to perform an information recovery analysis on the received signal in the receiver to obtain an estimated information bit. 
 
     
     
       6. The DCSK communication device of  claim 5 , wherein the modulation unit is configured for performing:
 carrying an x-axis amplitude, a y-axis amplitude and a z-axis amplitude of the three-dimensional constellation symbol respectively on the initial chaotic signal, the first shifted chaotic signal and the second shifted chaotic signal to obtain the information-bearing signal. 
 
     
     
       7. The DCSK communication device of  claim 5 , wherein the generating-transmitting unit is configured for performing steps of:
 performing pulse shaping on the initial chaotic signal and the information-bearing signal respectively to obtain a pulse chaotic signal and a pulse information-bearing signal; 
 based on a preset carrier frequency, generating the transmission signal according to the pulse chaotic signal and the pulse information-bearing signal; and 
 sending the transmission signal to the receiver to generate the received signal. 
 
     
     
       8. The DCSK communication device of  claim 5 , wherein the information recovery unit is configured for performing steps of:
 subjecting the received signal to filtering through a matched filter in the receiver to obtain a received reference signal and a received information-bearing signal; 
 processing the received reference signal by cyclic shift through a cyclic shift transformer to generate a received chaotic signal group, wherein the received chaotic signal group comprises the received reference signal, a third shifted chaotic signal and a fourth shifted chaotic signal; 
 calculating a decision vector according to the received chaotic signal group and the received information-bearing signal; 
 based on minimum Euclidean distance detection, estimating a label of the three-dimensional constellation symbol according to the decision vector; and 
 performing information recovery on the estimated label to obtain the estimated information bit. 
 
     
     
       9. A differential chaos shift keying (DCSK) communication equipment based on three-dimensional constellation, comprising:
 a processor; and 
 a memory; 
 wherein the memory is configured to store a program code and transmit the program code to the processor; and 
 the processor is configured to execute the DCSK communication method of  claim 1  according to an instruction of the program code. 
 
     
     
       10. A non-transitory computer-readable storage medium, wherein the computer-readable storage medium is configured to store a program code; and the program code is configured to be executed to implement the DCSK communication method of  claim 1 .